I want to buy some Seymour Duncan '59 pickups. But the selection says you can buy a SD *insert color* neck/bridge pickup. Click on the link to see what I mean. What I'm wondering is why there's a neck and a bridge pickup. Sorry, but I always thought that all pickups were the same, and that you can place them in either the neck or bridge. If you buy a neck and bridge SD, won't they be the same? I always thought it would be about placement. But I guess I'm wrong.. uh help?
R.I.P. Ronnie James Dio. Supplied amazing music to both me and my mother.

He will be missed.
The changes are usually very subtle for the Neck/Bridge of the same pickup.

The Bridge usually has a bit more output and a bit less high end to avoid being too bright. The Neck is the opposite, a bit less output and a little less low end to avoid being muddy.

The changes are minimal at best though, its not THAT big a deal.
American Strat:
Area 61 Neck, Area 67 Middle & Bridge
Spretzel Locking Tuners
Graphtech Nut & String Tree
Lots O' Love!

JSX + Orange Cab
Fender Blues Deluxe
Deluxe Memory Man
Fulltone Full Drive 2 & OCD
H2O Chorus/Echo
if you take the same pickup, the neck pickup is a slightly underwound version of the bridge, meaning less output and more high end.

Of course it doesn't really matter, a lot of people had bridge pickups that were wound less than the neck. (Dickie Betts, Jimmy Page)